A high-throughput air separation machine for improving the purity of recycled plastics

Abstract

The application relates to a high-flux air separation machine for improving the purity of regenerated plastics, and relates to the technical field of material recycling equipment, which comprises a rack, a sorting air duct and a cyclone shaker installed on the rack, a feeding port is formed in the side wall of the sorting air duct, a foreign matter discharging port is formed in the top of the sorting air duct, a discharging port is formed in the bottom of the sorting air duct, a fan is installed on the top of the cyclone shaker, a foreign matter feeding port is arranged close to the fan of the cyclone shaker, a connecting pipe is arranged between the foreign matter feeding port and the foreign matter discharging port, a tailing port is formed in the bottom of the cyclone shaker, a wind pipe is arranged on the air inlet of the fan, the wind pipe is connected with and communicates with the bottom of the sorting air duct, a plurality of mounting frames are detachably arranged on the sorting air duct between the feeding port and the discharging port, sorting nets are mounted on the mounting frames, sorting holes are uniformly formed in the sorting nets, and the diameters of the sorting holes on the sorting nets gradually decrease from the position close to the feeding port to the position far away from the feeding port. The machine has the effect of improving the purity of regenerated plastics after air separation.

Description

Technical Field

[0001] This application relates to the field of material recycling equipment, and in particular to a high-throughput air separation unit for improving the purity of recycled plastics. Background Technology

[0002] An air separation unit, also known as an air classifier, is an environmentally friendly device that uses airflow to separate light and heavy materials from solid waste. It is mainly used in solid waste sorting lines for industrial waste, automotive waste tailings, and scrap steel, to remove light particles such as lint, dust, and sponges. It utilizes the difference in suspension velocity between materials and impurities to improve the efficiency of subsequent equipment and prevent damage through airflow separation.

[0003] In the production of recycled plastics, air separation machines separate impurities from plastic fragments, and then melt and recast the plastic fragments into recycled plastic products. However, air separation machines cannot separate plastic fragments of different sizes. When the size of the plastic fragments differs greatly, if energy is saved and the melting of the plastic fragments is carried out under the melting conditions of the smallest plastic fragments, the larger plastic fragments are easy to be incompletely melted, which leads to a decrease in the purity of the recycled plastics produced. Summary of the Invention

[0004] In order to improve the purity of recycled plastics after air separation, this application provides a high-throughput air separator for improving the purity of recycled plastics.

[0005] This application provides a high-throughput air separation unit for improving the purity of recycled plastics, which adopts the following technical solution:

[0006] A high-throughput air separator for improving the purity of recycled plastics includes a frame on which a sorting duct and a cyclone separator are mounted. The sorting duct has a feed inlet on its side wall, a waste outlet at its top, and a discharge outlet at its bottom. A fan is mounted on the top of the cyclone separator, and a waste inlet is located near the fan. A connecting pipe is provided between the waste inlet and the waste outlet. A tailings outlet is located at the bottom of the cyclone separator. A duct is installed on the fan inlet, connecting to and communicating with the bottom of the sorting duct. Several detachable mounting frames are mounted on the sorting duct between the feed inlet and the discharge outlet. A sorting screen is mounted on each mounting frame, and sorting holes are evenly distributed on the screen, with the diameter of the holes gradually decreasing from near the feed inlet to far away from the feed inlet.

[0007] By adopting the above technical solution, and by setting up filters with different pore sizes in the sorting air duct, plastic fragments can be separated according to their size while impurities are separated in the sorting air duct. By separating plastic fragments of different sizes, the fragments are made to be similar in size when melting, which can better control the heat of melting plastic fragments of different sizes, and improve the purity of recycled plastic after air separation while saving energy.

[0008] Optionally, the sorting duct has a mounting hole groove corresponding to the mounting frame. The mounting hole groove includes a hole body and a groove body. The hole body penetrates one side wall of the sorting duct, and the groove body is opened on the inner wall of the other side wall except the side through which the hole body penetrates. The mounting frame is inserted into the sorting duct from the hole body and embedded in the groove body.

[0009] Optionally, the sorting duct is hinged with a baffle at the orifice, a rotating shaft is mounted on the baffle, and a torsion spring is provided between the rotating shaft and the side wall of the sorting duct. The torsion spring drives the baffle to rotate and close the orifice, and the mounting frame is inserted into the orifice to drive the baffle to open the orifice.

[0010] Optionally, a drive gear is mounted on the rotating shaft, and a drive rack is mounted on the mounting frame. When the mounting frame is installed inside the sorting duct, the drive rack drives the drive gear to drive the baffle parallel to the side wall of the sorting duct.

[0011] Optionally, a reinforcing block is slidably provided at the end of the baffle away from the hinge, and a reinforcing groove is provided on the inner wall of the sorting air duct corresponding to the reinforcing block. When the baffle closes the hole, the reinforcing block slides into the reinforcing groove.

[0012] Optionally, a drive rod is provided on the side of the baffle closing hole facing the outside of the sorting air duct. The drive rod is slidably disposed on the baffle. An elastic element is provided between the reinforcing block and the baffle. The elastic element drives the reinforcing block to slide and insert into the reinforcing groove. A wedge-shaped surface is opened on the reinforcing block corresponding to the drive rod. The drive rod abuts against the wedge-shaped surface. The drive rod slides toward the baffle and drives the reinforcing block to disengage from the reinforcing groove.

[0013] Optionally, the mounting frame is detachably equipped with a pressure plate, which is installed below the sorting mesh, and the pressure plate has a pressure plate hole of the same size as the sorting hole.

[0014] Optionally, a disassembly mechanism is provided between the mounting frame and the pressure plate. The disassembly mechanism includes a socket, a plug, and a blocking strip. The socket is opened in the mounting frame, the plug is fixed to the pressure plate, the plug is inserted into the socket, and the blocking strip is slidably disposed in the mounting frame. The blocking strip slides against the plug to block the socket opening or slides away from the plug to open the socket.

[0015] Optionally, a vibrating screen is provided on the frame at the feed inlet.

[0016] Optionally, a discharge airlock is installed on the discharge port, and a tail discharge airlock is installed on the tail outlet.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. By setting up filters with different pore sizes in the sorting air duct, plastic fragments can be separated according to their size while impurities are separated in the sorting air duct. By separating plastic fragments of different sizes, the fragments are made to be similar in size when melting, which can better control the heat of melting plastic fragments of different sizes and improve the purity of recycled plastic after air separation while saving energy.

[0019] 2. The mounting holes and slots are used for the installation and removal of the mounting frame, which facilitates the installation and removal of the mounting frame on the sorting air duct. The baffle can seal the holes after the mounting frame is removed, thereby reducing the probability of gas leakage in the sorting air duct and ensuring the normal use of the sorting air duct after the mounting frame is removed.

[0020] 3. When the mounting frame is installed in the sorting duct, the drive rack drives the drive gear to drive the baffle parallel to the side wall of the sorting duct. When the mounting frame is inserted into the mounting hole slot, the mounting frame will drive the baffle to rotate. However, the mounting frame can only drive the baffle to abut against the mounting frame. The baffle is placed horizontally, which can easily block the sorting hole, thus affecting the sorting of plastic fragments by the sorting screen. By driving the drive rack to drive the drive gear to rotate the baffle to a vertical position against the inner wall of the sorting duct, the probability of the baffle blocking the sorting hole can be reduced.

[0021] 4. The reinforcing groove and reinforcing block can reinforce the baffle when the baffle closes the hole, reducing the probability of the baffle being pushed open by external force. The wedge-shaped surface can drive the reinforcing block to slide and be stored in the baffle when the reinforcing block abuts against the inner wall of the sorting air duct. When the reinforcing block is aligned with the reinforcing groove, the reinforcing block slides and inserts into the reinforcing groove under the elastic force of the elastic element, thus facilitating the closing of the baffle hole. The drive rod abuts against the wedge-shaped surface and slides towards the baffle to drive the reinforcing block to disengage from the reinforcing groove. When the mounting frame is installed, the mounting frame abuts against the drive rod, so that the drive rod drives the reinforcing block to slide and disengage from the reinforcing groove through the wedge-shaped surface, thus facilitating abutment and driving the baffle to rotate when the mounting frame is inserted into the mounting hole.

[0022] 5. By disassembling the pressure plate, the floating plastic fragments are pressed into the installation frame, making it easier to remove the sorted plastic fragments when taking out the installation frame;

[0023] 6. Two connecting rods are connected to facilitate the simultaneous sliding of all the blocking bars. A return spring is provided between the blocking bars and the mounting frame. The spring force of the return spring drives the blocking bars to slide into the insertion hole, and pulls the connecting rod to drive the blocking bars to slide out of the insertion hole. The connecting rod can also serve as a gripping point to pull the mounting frame out of the sorting air duct. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the overall structure of the sorting air duct in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the overall structure of the mounting frame in an embodiment of this application.

[0027] Figure 4 This is a cross-sectional view of the sorting air duct in an embodiment of this application.

[0028] Figure 5 yes Figure 4 A magnified view of section A in the middle.

[0029] Figure 6 This is a structural cross-sectional view of the sorting duct from another perspective in an embodiment of this application.

[0030] Figure 7 yes Figure 6 A magnified view of section B in the middle.

[0031] Figure 8 yes Figure 3 A magnified view of section C.

[0032] In the diagram, 1. Frame; 2. Sorting air duct; 3. Cyclone cyclone; 4. Feed inlet; 5. Impurity outlet; 6. Discharge outlet; 7. Fan; 8. Impurity inlet; 9. Connecting pipe; 10. Tail outlet; 11. Air duct; 12. Mounting frame; 13. Sorting screen; 14. Sorting hole; 15. Mounting slot; 151. Hole body; 152. Slot body; 16. Baffle; 17. Rotating shaft; 18. Torsion spring; 19. Drive gear; 20. Drive rack; 21. Reinforcing block; 22. Reinforcing slot; 23. Drive rod; 24. Elastic component; 25. Wedge surface; 26. Pressure plate; 27. Disassembly and assembly mechanism; 271. Insertion hole; 272. Insertion block; 273. Blocking bar; 28. Connecting rod; 29. ​​Vibrating screen; 30. Discharge and unloading airlock; 31. Tail discharge and unloading airlock. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-8 The present application will be further described with reference to specific embodiments:

[0034] First, it should be noted that in the description of this application, the use of directional terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for descriptive purposes and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of numerical quantifiers such as "first," "second," and "third" is for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, interference fits, transition fits, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Therefore, those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] This application discloses a high-throughput air separation unit for improving the purity of recycled plastics, referring to... Figure 1 , Figure 2 and Figure 3The system includes a frame 1 mounted on the ground, which is formed by welding steel bars. A sorting duct 2 and a cyclone separator 3 are bolted to the frame 1. In this embodiment, the cyclone separator 3 is a cyclone separator that achieves solid-gas separation through centrifugal force. The sorting duct 2 is a rectangular hollow frame. An inlet 4 is provided on the side wall of the sorting duct 2 for plastic fragments to be air-separated. An outlet 5 is provided at the top of the sorting duct 2, and an outlet 6 is provided at the bottom. During air separation, impurities in the plastic fragments are discharged from the top outlet 5 of the sorting duct. 2. Plastic fragments in the sorting duct 2 are discharged from the outlet 6. A blower 7 is installed on the top of the cyclone cyclone 3. An inlet 8 is provided near the blower 7 in the cyclone cyclone 3. A connecting pipe 9 is provided between the inlet 8 and the outlet 5. In this embodiment, one end of the connecting pipe 9 is fixed to the inlet 8 with bolts, and the other end is fixed to the outlet 5 with bolts. When the connecting pipe 9 is connected to the sorting duct 2, a filter screen is installed at the installation position to reduce the probability of plastic fragments being discharged from the outlet 5. A tailings outlet 10 is opened at the bottom of the cyclone cyclone 3. The blower 7... A detachable air duct 11 is installed on the air inlet, connecting to and communicating with the bottom of the sorting duct 2. Impurities separated from the sorting duct 2 are separated from the gas by the action of the cyclone cyclone 3 and the fan 7. The separated impurity tail material is discharged from the tail material port 10. The separated gas is sent into the sorting duct 2 through the air duct 11 to act as the air source for sorting. Several mounting frames 12 are detachably installed on the sorting duct 2 between the feed inlet 4 and the discharge outlet 6. In this embodiment, three mounting frames 12 are provided, and sorting screens 13 are installed on the mounting frames 12. The sorting screen 13 is evenly provided with sorting holes 14. The diameter of the sorting holes 14 on the sorting screen 13 gradually decreases from near the feed inlet 4 to far away from the feed inlet 4. By setting filter screens with different hole diameters in the sorting air duct 2, the plastic fragments can be separated according to the size of the plastic fragments while impurities are separated in the sorting air duct 2. By separating plastic fragments of different sizes, the size of the fragments is made similar when they are melted, so that the heat of melting plastic fragments of different sizes can be better controlled, and the purity of the recycled plastic after air separation can be improved while saving energy.

[0036] Reference Figure 1 A vibrating screen 29 is installed on the frame 1 at the feed inlet 4. The vibrating screen 29 is connected to and communicates with the feed inlet 4. The vibrating screen 29 can screen the plastic fragments once by vibration, separating some of the impurities from the plastic fragments, thereby reducing the workload of the sorting air duct 2 and improving the sorting effect.

[0037] Reference Figure 1A discharge airlock 30 is installed on the discharge port 6, and a tail discharge airlock 31 is installed on the tail outlet 10. The discharge airlock 30 can discharge small plastic fragments at the bottom while maintaining the airtightness of the sorting duct 2, and the tail discharge airlock 31 can facilitate the discharge of impurities accumulated at the bottom of the cyclone cyclone 3 while maintaining the airtightness of the cyclone cyclone 3.

[0038] Reference Figure 4 and Figure 5 The sorting duct 2 has a mounting slot 15 corresponding to the mounting frame 12. The mounting slot 15 includes a hole 151 and a groove 152. The hole 151 penetrates one side wall of the sorting duct 2, and the groove 152 is formed on the inner wall of the other side wall except for the side through which the hole 151 penetrates. The mounting frame 12 is inserted into the sorting duct 2 through the hole 151 and embedded in the groove 152. The mounting slot 15 is used for the installation and removal of the mounting frame 12, which facilitates the installation and removal of the mounting frame 12 on the sorting duct 2. A baffle 16 is hinged to the hole 151 in the sorting duct 2, and a rotating shaft is installed on the baffle 16. 17. A torsion spring 18 is provided between the rotating shaft 17 and the side wall of the sorting air duct 2. The torsion spring 18 drives the baffle 16 to rotate and close the hole 151. The mounting frame 12 is inserted into the hole 151 to drive the baffle 16 to open the hole 151. The baffle 16 can seal the hole 151 after the mounting frame 12 is removed, thereby reducing the probability of gas leakage in the sorting air duct 2. This ensures the normal use of the sorting air duct 2 after the mounting frame 12 is removed. An elastic rubber pad is installed at the end of the baffle 16 away from the rotating shaft 17. The elastic rubber pad can deform to make the baffle 16 fit into the hole 151.

[0039] Reference Figure 4 and Figure 5 A drive gear 19 is mounted on the rotating shaft 17, and a drive rack 20 is mounted on the mounting frame 12. When the mounting frame 12 is installed in the sorting duct 2, the drive rack 20 drives the drive gear 19 to drive the baffle 16 parallel to the side wall of the sorting duct 2. When the mounting frame 12 is inserted into the mounting hole slot 15, the mounting frame 12 will drive the baffle 16 to rotate. However, the mounting frame 12 can only drive the baffle 16 to abut against the mounting frame 12. The horizontal placement of the baffle 16 can easily block the sorting hole 14, thereby affecting the sorting of plastic fragments by the sorting screen 13. By driving the drive gear 19 through the drive rack 20 to rotate the baffle 16 to a vertical position against the inner wall of the sorting duct 2, the probability of the baffle 16 blocking the sorting hole 14 can be reduced.

[0040] Reference Figure 4 , Figure 6 and Figure 7A reinforcing block 21 is slidably disposed at the end of the baffle 16 away from the hinge. In this embodiment, three reinforcing blocks 21 are evenly disposed along the length of the baffle 16. The reinforcing blocks 21 are slidably housed inside the baffle 16 or extend outside the baffle 16. The sorting air duct 2 has a reinforcing groove 22 on the inner wall of the hole 151 corresponding to the reinforcing block 21. When the baffle 16 closes the hole 151, the reinforcing block 21 slides into the reinforcing groove 22, and the reinforcing groove 22 cooperates with the reinforcing block 21 to reinforce the hole 151. The solid block 21 can reinforce the baffle 16 when the baffle 16 closes the hole 151, reducing the probability that the baffle 16 will be pushed open by external force. After the baffle 16 closes the hole 151, a drive rod 23 is provided on the side facing the outside of the sorting air duct 2. The drive rod 23 is slidably disposed on the baffle 16. An elastic element 24 is provided between the solid block 21 and the baffle 16. In this embodiment, the elastic element 24 is a spring. The elastic element 24 drives the solid block 21 to slide and insert. The reinforcing block 21 is inserted into the reinforcing groove 22. A wedge-shaped surface 25 is provided on the reinforcing block 21 corresponding to the drive rod 23. The wedge-shaped surface 25 is provided so that when the reinforcing block 21 abuts against the inner wall of the sorting air duct 2, the inner wall of the sorting air duct 2 abuts against the wedge-shaped surface 25 to drive the reinforcing block 21 to slide and be stored in the baffle 16. When the reinforcing block 21 is aligned with the reinforcing groove 22, the reinforcing block 21 slides and inserts into the reinforcing groove 22 under the elastic force of the elastic member 24, thereby facilitating the closing of the hole 151 of the baffle 16. The drive rod 23 abuts against the wedge-shaped surface 25 and slides towards the baffle 16 to drive the reinforcing block 21 to disengage from the reinforcing groove 22. When the mounting frame 12 is installed, the mounting frame 12 abuts against all the drive rods 23, so that all the drive rods 23 abut against the wedge-shaped surface 25 to drive the reinforcing block 21 to slide and disengage from the reinforcing groove 22, thereby facilitating the abutment and rotation of the baffle 16 when the mounting frame 12 is inserted into the mounting hole 15.

[0041] Reference Figure 2 , Figure 3 and Figure 8The mounting frame 12 is detachably equipped with a pressure plate 26, which is installed below the sorting screen 13. The pressure plate 26 has a hole of the same size as the sorting hole 14. By removing the pressure plate 26, it falls down and presses the floating plastic fragments into the mounting frame 12, making it easy to remove the sorted plastic fragments when the mounting frame 12 is taken out. A disassembly mechanism 27 is provided between the mounting frame 12 and the pressure plate 26. The disassembly mechanism 27 includes an insertion hole 271, an insertion block 272, and a blocking strip 273. The insertion hole 271 is opened in the mounting frame 12, and the insertion block 272 is fixed to the pressure plate 26. When the pressure plate 26 is installed in the mounting frame 12, the insertion block 272 is inserted into the insertion hole 271, and the blocking strip 273 is slidably installed in the mounting frame 12. The blocking strip 273 either slides against the insertion block 272 to block the opening of the insertion hole 271 or slides away from the insertion block 272 to open the insertion hole. 271, the blocking strip 273 restricts the insertion block 272 from disengaging from the insertion hole 271, thereby fixing the pressure plate 26 onto the mounting frame 12. In this embodiment, multiple sets of disassembly and assembly mechanisms 27 are evenly arranged on both sides of the width of the mounting frame 12, thereby stabilizing the installation of the pressure plate 26. The blocking strips 273 of the multiple sets of disassembly and assembly mechanisms 27 on both sides of the width of the mounting frame 12 are connected by connecting rods 28. The connecting rods 28 penetrate the mounting frame 12 and extend out of the sorting air duct 2. The two connecting rods 28 are connected, which facilitates the simultaneous sliding of all blocking strips 273. A return spring is provided between the blocking strip 273 and the mounting frame 12. The elastic force of the return spring drives the blocking strip 273 to slide into the insertion hole 271, and pulls the connecting rod 28 to drive the blocking strip 273 to slide out of the insertion hole 271. The connecting rod 28 can also serve as a gripping point for pulling the mounting frame 12 out of the sorting air duct 2.

[0042] The implementation principle of this application embodiment is as follows: Crushed plastic fragments are poured into a vibrating screen 29. After being separated by the vibrating screen 29, the plastic fragments enter the sorting air duct 2. Fine particles in the sorting air duct 2 enter the cyclone cyclone 3 through the connecting pipe 9 and undergo gas-solid separation within the cyclone cyclone 3. Solid impurities accumulate at the bottom of the cyclone cyclone 3 and are then discharged from the cyclone cyclone 3 through the tail discharge airlock 31. After the impurities are discharged, the power of the blower 7 is reduced, allowing the plastic fragments to pass through the corresponding sorting mesh 13 according to their size and remain there. Then, the connecting rod 28 is pulled to press the pressure plate 26, which presses the suspended plastic fragments onto the lower mounting frame 12. By continuing to pull the connecting rod 28, the mounting frame 12 is pulled out of the sorting air duct 2, at which point the baffle 16 closes. After disassembling all the mounting frames 12, the plastic fragments in the different mounting frames 12 are collected separately. After the plastic fragments in the mounting frames 12 are removed, the mounting frames 12 abut against the drive rod 23. The reinforcing block 21 of the drive rod 23 is disengaged from the reinforcing groove 22, so that the baffle 16 of the mounting frame 12 rotates and the mounting frame 12 is reinstalled into the mounting slot 15 to continue sorting. When the plastic fragments at the bottom of the sorting air duct 2 accumulate, the plastic fragments at the bottom of the sorting air duct 2 are discharged and collected by the discharge airlock 30. Then, according to the size of the collected plastic fragments, appropriate melting temperature and time are selected to melt them separately, so as to completely melt the plastic fragments in an energy-saving manner. Then, the molten liquid produced by melting is poured into the mold to produce recycled plastic.

[0043] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A high-throughput air separator for improving the purity of recycled plastics, comprising a frame (1), wherein a sorting duct (2) and a cyclone cyclone separator (3) are mounted on the frame (1), the sorting duct (2) has a feed inlet (4) on its side wall, a waste outlet (5) at the top of the sorting duct (2), and a discharge outlet (6) at the bottom of the sorting duct (2), wherein a blower (7) is mounted on the top of the cyclone cyclone separator (3), a waste inlet (8) is provided near the blower (7) of the cyclone cyclone separator (3), a connecting pipe (9) is provided between the waste inlet (8) and the waste outlet (5), a tailings outlet (10) is provided at the bottom of the cyclone cyclone separator (3), and an air duct (11) is provided on the air inlet of the blower (7), the air duct (11) being connected to and communicating with the bottom of the sorting duct (2), characterized in that: Several mounting frames (12) are detachably mounted on the sorting duct (2) between the inlet (4) and the outlet (6). A sorting screen (13) is mounted on the mounting frame (12). Sorting holes (14) are evenly distributed on the sorting screen (13). The diameter of the sorting holes (14) on the sorting screen (13) gradually decreases from near the inlet (4) to far away from the inlet (4). The sorting duct (2) is provided with mounting slots (15) corresponding to the mounting frames (12). The mounting slots (15) include a hole body (151) and a groove body (152). The hole body (151) penetrates one side wall of the sorting duct (2). The groove body (152) is opened on the inner wall of the other side wall except for the side through which the hole body (151) penetrates. The mounting frame (12) is inserted into the sorting duct through the hole body (151). (2) Embedded in the groove (152); the sorting air duct (2) is hinged to the hole (151) with a baffle (16), a rotating shaft (17) is installed on the baffle (16), and a torsion spring (18) is provided between the rotating shaft (17) and the side wall of the sorting air duct (2). The torsion spring (18) drives the baffle (16) to rotate and close the hole (151). The mounting frame (12) is inserted into the hole (151) to drive the baffle (16) to open the hole (151). A driving gear (19) is installed on the rotating shaft (17), and a driving rack (20) is installed on the mounting frame (12). When the mounting frame (12) is installed in the sorting air duct (2), the driving rack (20) drives the driving gear (19) to drive the baffle (16) parallel to the side wall of the sorting air duct (2).

2. A high-throughput air separation unit for improving the purity of recycled plastics according to claim 1, characterized in that: The baffle (16) has a reinforcing block (21) slidably disposed at the end away from the hinge. The sorting air duct (2) has a reinforcing groove (22) on the inner wall of the hole (151) corresponding to the reinforcing block (21). When the baffle (16) closes the hole (151), the reinforcing block (21) slides into the reinforcing groove (22).

3. A high-throughput air separation unit for improving the purity of recycled plastics according to claim 2, characterized in that: A drive rod (23) is provided on the side of the baffle (16) facing the outside of the sorting air duct (2) after the closed hole (151) is closed. The drive rod (23) is slidably disposed on the baffle (16). An elastic element (24) is provided between the reinforcing block (21) and the baffle (16). The elastic element (24) drives the reinforcing block (21) to slide into the reinforcing groove (22). A wedge-shaped surface (25) is opened on the reinforcing block (21) corresponding to the drive rod (23). The drive rod (23) abuts against the wedge-shaped surface (25). The drive rod (23) slides towards the baffle (16) to drive the reinforcing block (21) to disengage from the reinforcing groove (22).

4. A high-throughput air separation unit for improving the purity of recycled plastics according to claim 3, characterized in that: The mounting frame (12) is detachably provided with a pressure plate (26), which is installed below the sorting mesh (13). The pressure plate (26) has a pressure plate (26) hole that is the same size as the sorting hole (14).

5. A high-throughput air separation unit for improving the purity of recycled plastics according to claim 4, characterized in that: A disassembly and assembly mechanism (27) is provided between the mounting frame (12) and the pressure plate (26). The disassembly and assembly mechanism (27) includes a socket (271), a plug (272), and a blocking strip (273). The socket (271) is opened in the mounting frame (12). The plug (272) is fixed on the pressure plate (26). The plug (272) is inserted into the socket (271). The blocking strip (273) is slidably disposed in the mounting frame (12). The blocking strip (273) slides against the plug (272) to block the opening of the socket (271) or slides away from the plug (272) to open the socket (271).

6. A high-throughput air separation unit for improving the purity of recycled plastics according to claim 1, characterized in that: A vibrating screen (29) is installed on the frame (1) at the feed inlet (4).

7. A high-throughput air separation unit for improving the purity of recycled plastics according to claim 1, characterized in that: A discharge airlock (30) is installed on the discharge port (6), and a tail discharge airlock (31) is installed on the tail outlet (10).

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